William f



(No Mode1.)'

- W. P. BARNES.

MECHANISM FOR OPERATING SGROLL SAWS, &c.

No. 413,475. Patented Oct 22. 1889.

UNITED STATES WILLIAM F. BARNES, OF ROCKFORD, ILLINOIS, ASSIGNOR TO THEW. F. &

PATENT OFFIcE.

JOHN BARNES COMPANY, OF SAME PLACE.

MECHANISM FOR OPERATING SCROLL-SAWS, 800.

SPECIFICATION forming part of Letters Patent No. 413,475, dated. October22, 1889. Application filed January 11, 1882. Serial No. 296,057. (Nomodel.)

To all whom it may concern.- I

Be it known that 1, WILLIAM F. BARNES, a citizen of the United States,residing at Rockford, in the county of \Vinnebago and State of'lllinois,have invented certain new and useful Improvements in Mechanism forOperating Scroll-Saws, &c., of which the following is a specification.

The objection raised to saws of this class is the slipping of the beltupon the small driven pulley, thereby limiting its use to very lightwork.

The object of this invention is to overcome this difficulty and providemeans for positively driving the saw.

In the accompanying drawings, Figure 1 is an isometrical representationof a scroll-saw embodying my improvements. Fig. 2 is a ,a section inskeleton, showing the connections of the belt; and Fig. 3 is an enlargedview of the clutch, showing the position of the sprocket-wheel 14. V

The scroll-saw represented in the drawings in the main is the same assecured by Letters Patent No. 328,377, granted October 13, 1885, andconsists of'legs 1 1 and a rear leg 2, connected bya transverse bar 3,forming a tripod support to the table 4, fixed thereon, the parallelarms 5 of the saw-frame, their bracketsupport 6, the connecting-rod '7,saw'8, balance-wheel 9, its wrist-pin and pitman 10, treadle 11,clutching mechanism connecting the driving mechanism with thebalancewheel to impart motion to the saw, also the belt tensionmechanism consisting of the spring-actuated oscillating arm 12,supported to oscillate upon a spring supporting-shaft 13. The clutchingmechanism C may be of any ordinary construction, or of the constructionshown in Patent No. 146,636, granted to me January 20, 1874, which isshown in the accompanying drawings. This clutch mechanism is providedwith-a sprocket-wheel 14, which moves therewith and is mounted torevolve upon the shaft 15. A sheave 16, having its periphery grooved toreceive the fiat perforated belt, is supported to revolve onjournal-bearings within the forked free end 17 of the oscillating arm12. A flat belt 18 is perforated at suitable intervals to correspondwith the sprockets of the wheel 14. This belt is connected at one end tothe support 19, connected with the main frame and passed around thesheave 16, over the sprocket-wheel14, and secured to the free end of thetreadle 11. By this construction of the parts, downward motion beingimparted to the treadle will impart a forward rotary motion to thesprocket-wheel, and by reason of its clutch-connection with thebalance-wheel will impart a forward rotary movement to thebalance-wheel, and in turn will cause the sawframe to vibrate by itspitman-connection. This downward movement of the treadle will cause theoscillating arm to yield against its spring action. In releasing thetreadle the spring oscillating arm will take up the slack of the belt,and by reason of the sprockets of the sprocket-wheel engaging theperforations of the belt will cause the sprocket-wheel and the clutchmechanism to rotate backward,

placing the parts in position to be again 0perated.

By the employment of the perforated belt and a sprocket-wheel carryingthe clutch mechanism a positive movement is imparted to the saw, and allslipping of the belt prevented, thereby greatly enlarging the usefulnessof the saw.

I claim as my invention- 1. The combination of a sprocket-wheel, aclutch mechanism carried by said Wheel, a perforated belt engaging thesprockets of the wheel, mechanism for imparting motion to the beltintermediate its ends, and a take-up forthe belt, substantially as setforth.

2. The combination of a sprocket-wheel, a clutch mechanism carried bysaid wheel, a perforated belt engaging the sprocket of the wheel, afoot-treadle for imparting motion to the belt, and a spring-actuatedoscillating take-up arm engaging the belt intermediate its ends,substantially as set forth.

WILLIAM F. BARNES. Titnesses:

JOHN BARNES, A. 0. BEHEL.

